CN210536609U - Forward and reverse rotation motor control protection circuit - Google Patents
Forward and reverse rotation motor control protection circuit Download PDFInfo
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- CN210536609U CN210536609U CN201922119433.XU CN201922119433U CN210536609U CN 210536609 U CN210536609 U CN 210536609U CN 201922119433 U CN201922119433 U CN 201922119433U CN 210536609 U CN210536609 U CN 210536609U
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Abstract
The utility model relates to the technical field of motor protection, and discloses a positive and negative rotation motor control protection circuit, which comprises a receiving circuit, wherein the receiving circuit is electrically connected with a plurality of silicon controlled opto-isolator which are connected in series, and the output end of each silicon controlled opto-isolator is connected in parallel with a divider resistor; the receiving circuit controls the back ground potential of the optical coupler isolator through the serially connected silicon controlled rectifier, and the output end of the silicon controlled rectifier control optical coupler isolator electrically connected with the receiving circuit is electrically connected with a controlled end for driving the silicon controlled rectifier through a first current limiting resistor; the output end of the thyristor-controlled optocoupler isolator with the ground potential is electrically connected with the control end of the driving thyristor and is electrically connected with the other controlled end of the driving thyristor through a clamping resistor, and the plurality of divider resistors are connected in series and then connected in parallel between the two controlled ends of the driving thyristor. The low-voltage 220V silicon controlled optocoupler isolator can be suitable for the high-voltage 380V three-phase electrical environment, an expensive high-voltage control chip is not needed, and the circuit cost is reduced.
Description
Technical Field
The utility model belongs to the technical field of the motor protection technique and specifically relates to a just reverse motor control protection circuit is related to.
Background
The numerical control machine tool is a digital control machine tool for short, and is an automatic machine tool provided with a program control system. The control system is capable of logically processing and decoding a program defined by a control code or other symbolic instructions, represented by coded numbers, which are input to the numerical control device via the information carrier. After operation, the numerical control device sends out various control signals to control the action of the machine tool, and the parts are automatically machined according to the shape and the size required by the drawing.
At present, a numerical control machine tool with a motor using a 220V power supply adopts a single-wire control circuit formed by combining a single silicon controlled rectifier control optical coupler isolator and a single silicon controlled rectifier.
The above prior art solutions have the following drawbacks: if the motor of the numerical control machine tool adopts a three-phase motor, the control voltage of the motor is 380V, the traditional silicon controlled rectifier control circuit cannot be competent, and a silicon controlled rectifier control optocoupler supporting 380V three-phase high voltage is not available in the current market, so that a special voltage control chip is required for control, and the cost is high.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a two optical coupling partial pressure drive silicon controlled rectifier, with low costs just reverse motor control protection circuit is provided to not enough to prior art exists, one of the purposes of the utility model.
In order to achieve the above purpose, the utility model provides a following technical scheme:
a positive and negative rotation motor control protection circuit comprises a receiving circuit used for receiving external control signals, wherein the receiving circuit is electrically connected with a plurality of silicon controlled rectifier control optical coupling isolators which are connected in series, the input ends of the silicon controlled rectifier control optical coupling isolators are light emitting diodes, the output ends of the silicon controlled rectifier control optical coupling isolators are photosensitive silicon controlled rectifiers, the light emitting diodes of adjacent silicon controlled rectifier control optical coupling isolators are connected in series, the photosensitive silicon controlled rectifiers of adjacent silicon controlled rectifier control optical coupling isolators are connected in series, and the output ends of each silicon controlled rectifier control optical coupling isolator are connected in parallel with a divider resistor;
the receiving circuit controls the rear ground potential of the input end of the optical coupler isolator through a plurality of serially connected silicon controlled rectifiers, and the output end of the silicon controlled rectifier control optical coupler isolator electrically connected with the receiving circuit is electrically connected with a controlled end for driving the silicon controlled rectifiers through a first current limiting resistor; the output end of the thyristor-controlled optocoupler isolator with the ground potential is electrically connected with the control end of the driving thyristor and is electrically connected with the other controlled end of the driving thyristor through a clamping resistor, and the plurality of divider resistors are connected in series and then connected in parallel between the two controlled ends of the driving thyristor.
Through adopting above-mentioned technical scheme, through the parallelly connected divider resistance of output at silicon controlled rectifier control opto-isolator, a plurality of silicon controlled rectifier control opto-isolator establish ties the back, carry out the partial pressure after divider resistance also establishes ties, divide the voltage value that obtains on going silicon controlled rectifier control opto-isolator through divider resistance, the rational distribution of voltage when accomplishing two opto-couplers operation, let low pressure 220V's silicon controlled rectifier control opto-isolator can be suitable for under the electrical environment of high pressure 380V three-phase, need not expensive high-pressure control chip, reduce circuit cost.
The present invention may be further configured in a preferred embodiment as: and a filter resistor and a filter capacitor which are connected in series are electrically connected between the two controlled ends of the driving controllable silicon.
Through adopting above-mentioned technical scheme, filter resistance and filter capacitance cooperation can let the voltage signal received on the drive controllable silicon more stable, improve silicon controlled rectifier control opto-isolator control effect.
The present invention may be further configured in a preferred embodiment as: the receiving circuit comprises a first receiving resistor electrically connected with an external control signal, the first receiving resistor is grounded through a second receiving resistor, and the second receiving resistor is connected with a receiving capacitor in parallel.
By adopting the technical scheme, the first receiving resistor and the second receiving resistor divide the voltage of the external control signal, and the divided voltage signal is filtered by the receiving capacitor and then transmitted to the silicon controlled rectifier control optocoupler isolator.
The present invention may be further configured in a preferred embodiment as: one end of the first receiving resistor, which is electrically connected with an external control signal, is connected with a second current-limiting resistor, and the second current-limiting resistor passes through the LED grounding potential.
Through adopting above-mentioned technical scheme, second current-limiting resistor and LED cooperation can outwards demonstrate external control signal's state through light signal, let the state visual.
The present invention may be further configured in a preferred embodiment as: the resistance value of the divider resistor is not lower than 10M ohm, and the precision of the divider resistor is not lower than 1%.
By adopting the technical scheme, the high-precision voltage-dividing resistor is used, and the average distribution of the voltage when the adjacent silicon controlled rectifiers control the optical coupling isolator is realized.
The present invention may be further configured in a preferred embodiment as: the receiving circuit, the at least two silicon controlled rectifier control optical coupling isolators and the control silicon controlled rectifier are arranged in a group of driving modules, two phases of the 380V motor are respectively and electrically connected with two groups of driving modules, and the rest phase of the 380V motor is electrically connected with one group of driving modules.
By adopting the technical scheme, a hardware circuit basis is provided for rotation control of the 380V three-phase motor.
The present invention may be further configured in a preferred embodiment as: two groups of driving modules which are electrically connected with two phases of three phases of the 380V motor form an H-bridge driving circuit.
By adopting the technical scheme, the H-bridge driving circuit provides a hardware circuit foundation for the 380V three-phase motor to realize positive and negative rotation.
In summary, the invention includes at least one of the following beneficial technical effects:
(1) the output end of the silicon controlled optocoupler isolator is connected with a divider resistor in parallel, a high-precision resistor is used as the divider resistor, the high-precision divider resistor is used, the average distribution of the voltage of the adjacent silicon controlled optocoupler isolators during operation is achieved, after a plurality of silicon controlled optocoupler isolators are connected in series, the divider resistor is also connected in series for voltage division, the voltage value obtained on the silicon controlled optocoupler isolator is divided through the divider resistor, so that the low-voltage 220V silicon controlled optocoupler isolator can be applied to the high-voltage 380V three-phase electrical environment, an expensive high-voltage control chip is not needed, and the circuit cost is reduced;
(2) through setting up filter resistance and filter capacitance, filter out the clutter, let the voltage signal received on the drive controllable silicon more stable, improve silicon controlled rectifier control opto-isolator control effect.
Drawings
Fig. 1 is a circuit diagram of the present invention;
FIG. 2 is a circuit diagram of the H-bridge of the present invention;
fig. 3 is an enlarged view of a portion a of fig. 2.
Reference numerals: 1. a receiving circuit; 2. the silicon controlled rectifier controls the optical coupling isolator; 3. a voltage dividing resistor; 4. and driving the silicon controlled rectifier.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples.
Referring to fig. 1 and fig. 2, for the utility model discloses a positive reverse motor control protection circuit, including the receiving circuit 1 who is used for receiving external control signal, receiving circuit 1 includes the first receiving resistance R116 of being connected with external control signal electricity, and first receiving resistance R116 has receiving capacitance C83 through second receiving resistance R265 earthing potential, and second receiving resistance R265 connects in parallel. The first receiving resistor R116 and the second receiving resistor R265 divide the voltage of the external control signal, and the divided voltage signal is filtered by the receiving capacitor C83 and then transmitted. One end of the first receiving resistor R116 electrically connected with the external control signal is connected with a second current limiting resistor R104, and the second current limiting resistor R104 is connected with the ground potential of the LED. The second current limiting resistor R104 is matched with the LED, and can display the state of an external control signal through an optical signal to the outside, so that the state of an electric signal is visualized.
The receiving circuit 1 is electrically connected with a plurality of thyristor-controlled opto-isolator 2 which are connected in series, and in the technical scheme, two thyristor-controlled opto-isolator 2 are connected in series, for example, the thyristor-controlled opto-isolator 2U58 and the thyristor-controlled opto-isolator 2U 25. The input end of the thyristor controlled optical coupler isolator 2U58 is a light emitting diode U58D1, the output end of the thyristor controlled optical coupler isolator 2U58 is a photosensitive thyristor U58D2, the input end of the thyristor controlled optical coupler isolator 2U25 is a light emitting diode U25D1, and the output end of the thyristor controlled optical coupler isolator 2U25 is a photosensitive thyristor U25D 2. The light emitting diode U58D1 is connected with the light emitting diode U25D1 in series, the photosensitive controlled silicon U58D2 is connected with the photosensitive controlled silicon U25D2 in series, the output end of the photosensitive controlled silicon U58D2 is connected with a voltage dividing resistor 3R261 in parallel, and the output end of the photosensitive controlled silicon U25D2 is connected with a voltage dividing resistor 3R266 in parallel. The electrical parameters of the divider resistor 3R261 and the divider resistor 3R266 are consistent, the resistance value is not lower than 10M ohm, and the precision of the resistance value is not lower than 1%. And the high-precision voltage dividing resistor 3 is used for realizing the average distribution of the voltage when the adjacent silicon controlled rectifier control optical isolator 2 operates.
The receiving circuit 1 is connected with the grounding potential of the light emitting diode U25D1 through the light emitting diode U58D1 and the light emitting diode U25D1 which are connected in series, and one end of the photosensitive controlled silicon U25D2 far away from the photosensitive controlled silicon U85D2 is electrically connected with a controlled end of the driving controlled silicon 4U29 through a first current limiting resistor R117. A filter resistor R122 and a filter capacitor C21 which are connected in series are electrically connected between the two controlled ends of the drive thyristor 4U 29. Filter resistance R122 and filter capacitance C21 cooperation can let the voltage signal who receives more stable on the drive silicon controlled rectifier 4U29, improve silicon controlled rectifier control opto-isolator 2U58 and silicon controlled rectifier control opto-isolator 2U 25's control effect. One end of the photosensitive thyristor U58D2, which is far away from the thyristor control optical coupler isolator 2U25, is electrically connected with the control end of the driving thyristor 4U29 and is electrically connected with the other controlled end of the driving thyristor 4U29 through a clamping resistor R273, and the voltage dividing resistor 3R261 and the voltage dividing resistor 3R266 are connected in series and then connected in parallel between the two controlled ends of the driving thyristor 4U 29.
The implementation principle of the embodiment is as follows: as shown in fig. 2 and 3, the receiving circuit 1, the thyristor-controlled opto-isolator 2U58, the thyristor-controlled opto-isolator 2U25, and the controlled thyristor U29 are arranged in a group of driving modules, two phases of the 380V motor are electrically connected to two groups of driving modules, and the remaining phase is electrically connected to one group of driving modules. Two groups of driving modules which are electrically connected with two phases of three phases of the 380V motor form an H-bridge driving circuit. Returning to fig. 1, the receiving circuit 1 receives an external control signal, the first receiving resistor R116, the second receiving resistor R265 and the receiving capacitor C83 perform voltage division and filtering processing on the control signal, so that the control signal is more stably input into the scr-controlled optocoupler isolator 2U25 and the scr-controlled optocoupler isolator 2U58, the light emitting diode U58D1 and the light emitting diode U25D1 transmit the signal to the photothyristor U58D2 and the photothyristor U25D2 in an optoisolation manner, and the voltage values obtained by the thyristor-controlled optocoupler isolator 2U25 and the scr-controlled optocoupler isolator 2U58 are equally divided into half of the voltage values applied by the photothyristor U58D2 and the photothyristor U25D2 and the voltage dividing resistor 3 connected in parallel with the photothyristor U25D 2. The reasonable distribution of voltage when accomplishing two opto-couplers operation lets low pressure 220V's silicon controlled rectifier control opto-isolator 2 under the electric environment of high pressure 380V three-phase, can normally control H bridge drive circuit, and H bridge drive circuit provides the hardware circuit basis for rotation and positive and negative rotation that 380V three-phase motor realized. And an expensive high-voltage control chip is not needed, so that the circuit cost is reduced.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (7)
1. A positive and negative rotation motor control protection circuit comprises a receiving circuit (1) for receiving external control signals, and is characterized in that the receiving circuit (1) is electrically connected with a plurality of silicon controlled opto-isolator isolators (2) which are connected in series, the input ends of the silicon controlled opto-isolators (2) are light emitting diodes, the output ends of the silicon controlled opto-isolators (2) are photosensitive silicon controlled, the light emitting diodes of adjacent silicon controlled opto-isolators (2) are connected in series, the photosensitive silicon controlled of adjacent silicon controlled opto-isolators (2) are connected in series, and the output end of each silicon controlled opto-isolator (2) is connected in parallel with a divider resistor (3);
the receiving circuit (1) controls the rear ground potential of the input end of the optical coupler isolator (2) through a plurality of serially connected silicon controlled rectifiers, and the output end of the silicon controlled optical coupler isolator (2) electrically connected with the receiving circuit (1) is electrically connected with a controlled end of a driving silicon controlled rectifier (4) through a first current limiting resistor; the output end of the thyristor-controlled optical-coupler isolator (2) with the ground potential is electrically connected with the control end of the driving thyristor (4) and is electrically connected with the other controlled end of the driving thyristor (4) through a clamping resistor, and the plurality of voltage-dividing resistors (3) are connected in series and then are connected in parallel between the two controlled ends of the driving thyristor (4).
2. The control protection circuit for the positive and negative rotation motor according to claim 1, wherein a filter resistor and a filter capacitor which are connected in series are electrically connected between the two controlled ends of the drive controllable silicon (4).
3. The control protection circuit for the positive and negative rotation motor according to claim 1, wherein the receiving circuit (1) comprises a first receiving resistor electrically connected with an external control signal, the first receiving resistor is grounded through a second receiving resistor, and the second receiving resistor is connected with a receiving capacitor in parallel.
4. The control protection circuit for the positive and negative rotation motor according to claim 3, wherein one end of the first receiving resistor electrically connected with an external control signal is connected with a second current limiting resistor, and the second current limiting resistor is grounded through an LED.
5. The control protection circuit for the positive and negative rotation motor according to claim 1, wherein the resistance value of the voltage dividing resistor (3) is not lower than 10M ohm, and the precision of the voltage dividing resistor (3) is not lower than 1%.
6. The control protection circuit for the forward and reverse rotation motor according to claim 1, wherein the receiving circuit (1), the at least two thyristor-controlled optical coupler isolators (2) and the controlled thyristors are arranged in a group of driving modules, two phases of three phases of the 380V motor are respectively electrically connected with two groups of driving modules, and the remaining phase is electrically connected with one group of driving modules.
7. The control protection circuit for the forward and reverse rotation motor according to claim 6, wherein two groups of driving modules electrically connected with two phases of three phases of the 380V motor form an H-bridge driving circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922119433.XU CN210536609U (en) | 2019-11-29 | 2019-11-29 | Forward and reverse rotation motor control protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922119433.XU CN210536609U (en) | 2019-11-29 | 2019-11-29 | Forward and reverse rotation motor control protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210536609U true CN210536609U (en) | 2020-05-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922119433.XU Active CN210536609U (en) | 2019-11-29 | 2019-11-29 | Forward and reverse rotation motor control protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210536609U (en) |
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2019
- 2019-11-29 CN CN201922119433.XU patent/CN210536609U/en active Active
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